Here is one reference:
History of Atmospheric Lead Deposition Since 12,370 14C yr BP from a Peat
Bog, Jura Mountains, Switzerland
W. Shotyk, D. Weiss, P. G. Appleby, A. K. Cheburkin, R. Frei, M. Gloor, J.
D. Kramers, S. Reese, and W. O. Van Der Knaap
Science Sep 11 1998: 1635-1640
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